Design of Fuzzy Variable Frequency Control System for Local Ventilator

Local ventilator frequency conversion control has a certain lag. Because of the failure to control the abrupt gas emission in time, it will lead to the problem of gas exceeding the limit. If the ventilator continues to operate at full frequency, it will be in an under load state during the process of tunneling in coal mines, leading to waste of electrical energy. In response to the above issues, the principle of variable frequency energy-saving control for local ventilator is analyzed based on their ventilation characteristics. A fuzzy variable frequency control system for local ventilator is designed based on fuzzy control theory. A testing platform combining local ventilation devices and signal acquisition devices was established, and frequency conversion testing tests were conducted on the system. The experimental results show that the fuzzy variable frequency control system has certain practicality, which can timely control the real-time emission of gas, control the gas concentration within a safe range, and effectively overcome the hysteresis of ventilation system control.